mirror of
https://github.com/PyCQA/flake8.git
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a1fdb5a2b5
This simplifies the changes, reduces the scope of refactors apparently for refactoring's sake and ensures that the internals are reasonable. It also airs on the side of preserving information rather than discarding or overwriting it.
310 lines
10 KiB
Python
310 lines
10 KiB
Python
"""Tests for the FileProcessor class."""
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import ast
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import optparse
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import tokenize
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from flake8 import processor
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import mock
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import pytest
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def options_from(**kwargs):
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"""Generate a Values instances with our kwargs."""
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kwargs.setdefault('hang_closing', True)
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kwargs.setdefault('max_line_length', 79)
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kwargs.setdefault('verbose', False)
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kwargs.setdefault('stdin_display_name', 'stdin')
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return optparse.Values(kwargs)
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def test_read_lines_splits_lines():
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"""Verify that read_lines splits the lines of the file."""
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file_processor = processor.FileProcessor(__file__, options_from())
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lines = file_processor.lines
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assert len(lines) > 5
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assert '"""Tests for the FileProcessor class."""\n' in lines
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@pytest.mark.parametrize('first_line', [
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'\xEF\xBB\xBF"""Module docstring."""\n',
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u'\uFEFF"""Module docstring."""\n',
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])
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def test_strip_utf_bom(first_line):
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r"""Verify that we strip '\xEF\xBB\xBF' from the first line."""
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lines = [first_line]
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file_processor = processor.FileProcessor('-', options_from(), lines[:])
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assert file_processor.lines != lines
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assert file_processor.lines[0] == '"""Module docstring."""\n'
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@pytest.mark.parametrize('lines, expected', [
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(['\xEF\xBB\xBF"""Module docstring."""\n'], False),
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([u'\uFEFF"""Module docstring."""\n'], False),
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(['#!/usr/bin/python', '# flake8 is great', 'a = 1'], False),
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(['#!/usr/bin/python', '# flake8: noqa', 'a = 1'], True),
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(['# flake8: noqa', '#!/usr/bin/python', 'a = 1'], True),
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(['#!/usr/bin/python', 'a = 1', '# flake8: noqa'], True),
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])
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def test_should_ignore_file(lines, expected):
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"""Verify that we ignore a file if told to."""
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file_processor = processor.FileProcessor('-', options_from(), lines)
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assert file_processor.should_ignore_file() is expected
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@mock.patch('flake8.utils.stdin_get_value')
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def test_read_lines_from_stdin(stdin_get_value):
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"""Verify that we use our own utility function to retrieve stdin."""
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stdin_value = mock.Mock()
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stdin_value.splitlines.return_value = []
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stdin_get_value.return_value = stdin_value
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file_processor = processor.FileProcessor('-', options_from())
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stdin_get_value.assert_called_once_with()
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stdin_value.splitlines.assert_called_once_with(True)
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@mock.patch('flake8.utils.stdin_get_value')
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def test_stdin_filename_attribute(stdin_get_value):
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"""Verify that we update the filename attribute."""
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stdin_value = mock.Mock()
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stdin_value.splitlines.return_value = []
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stdin_get_value.return_value = stdin_value
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file_processor = processor.FileProcessor('-', options_from())
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assert file_processor.filename == 'stdin'
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@mock.patch('flake8.utils.stdin_get_value')
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def test_read_lines_uses_display_name(stdin_get_value):
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"""Verify that when processing stdin we use a display name if present."""
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stdin_value = mock.Mock()
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stdin_value.splitlines.return_value = []
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stdin_get_value.return_value = stdin_value
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file_processor = processor.FileProcessor('-', options_from(
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stdin_display_name='display_name.py'
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))
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assert file_processor.filename == 'display_name.py'
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def test_line_for():
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"""Verify we grab the correct line from the cached lines."""
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file_processor = processor.FileProcessor('-', options_from(), lines=[
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'Line 1',
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'Line 2',
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'Line 3',
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])
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for i in range(1, 4):
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assert file_processor.line_for(i) == 'Line {0}'.format(i)
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def test_next_line():
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"""Verify we update the file_processor state for each new line."""
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file_processor = processor.FileProcessor('-', options_from(), lines=[
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'Line 1',
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'Line 2',
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'Line 3',
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])
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for i in range(1, 4):
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assert file_processor.next_line() == 'Line {}'.format(i)
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assert file_processor.line_number == i
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@pytest.mark.parametrize('error_code, line, expected_indent_char', [
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('E101', '\t\ta = 1', '\t'),
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('E101', ' a = 1', ' '),
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('W101', 'frobulate()', None),
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('F821', 'class FizBuz:', None),
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])
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def test_check_physical_error(error_code, line, expected_indent_char):
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"""Verify we update the indet char for the appropriate error code."""
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file_processor = processor.FileProcessor('-', options_from(), lines=[
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'Line 1',
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])
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file_processor.check_physical_error(error_code, line)
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assert file_processor.indent_char == expected_indent_char
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@pytest.mark.parametrize('params, args, expected_kwargs', [
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({'blank_before': True, 'blank_lines': True},
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None,
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{'blank_before': 0, 'blank_lines': 0}),
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({'noqa': True, 'fake': True},
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{'fake': 'foo'},
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{'noqa': False, 'fake': 'foo'}),
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({'blank_before': True, 'blank_lines': True, 'noqa': True},
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{'blank_before': 10, 'blank_lines': 5, 'noqa': True},
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{'blank_before': 10, 'blank_lines': 5, 'noqa': True}),
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({}, {'fake': 'foo'}, {'fake': 'foo'}),
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({'non-existent': False}, {'fake': 'foo'}, {'fake': 'foo'}),
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])
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def test_keyword_arguments_for(params, args, expected_kwargs):
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"""Verify the keyword args are generated properly."""
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file_processor = processor.FileProcessor('-', options_from(), lines=[
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'Line 1',
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])
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kwargs_for = file_processor.keyword_arguments_for
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assert kwargs_for(params, args) == expected_kwargs
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def test_keyword_arguments_for_does_not_handle_attribute_errors():
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"""Verify we re-raise AttributeErrors."""
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file_processor = processor.FileProcessor('-', options_from(), lines=[
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'Line 1',
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])
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with pytest.raises(AttributeError):
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file_processor.keyword_arguments_for(['fake'])
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@pytest.mark.parametrize('unsplit_line, expected_lines', [
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('line', []),
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('line 1\n', ['line 1']),
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('line 1\nline 2\n', ['line 1', 'line 2']),
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('line 1\n\nline 2\n', ['line 1', '', 'line 2']),
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])
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def test_split_line(unsplit_line, expected_lines):
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"""Verify the token line spliting."""
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file_processor = processor.FileProcessor('-', options_from(), lines=[
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'Line 1',
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])
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actual_lines = list(file_processor.split_line((1, unsplit_line)))
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assert expected_lines == actual_lines
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assert len(actual_lines) == file_processor.line_number
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def test_build_ast():
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"""Verify the logic for how we build an AST for plugins."""
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file_processor = processor.FileProcessor('-', options_from(), lines=[
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'a = 1\n'
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])
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module = file_processor.build_ast()
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assert isinstance(module, ast.Module)
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def test_next_logical_line_updates_the_previous_logical_line():
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"""Verify that we update our tracking of the previous logical line."""
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file_processor = processor.FileProcessor('-', options_from(), lines=[
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'a = 1\n'
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])
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file_processor.indent_level = 1
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file_processor.logical_line = 'a = 1'
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assert file_processor.previous_logical == ''
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assert file_processor.previous_indent_level is 0
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file_processor.next_logical_line()
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assert file_processor.previous_logical == 'a = 1'
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assert file_processor.previous_indent_level == 1
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def test_visited_new_blank_line():
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"""Verify we update the number of blank lines seen."""
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file_processor = processor.FileProcessor('-', options_from(), lines=[
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'a = 1\n'
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])
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assert file_processor.blank_lines == 0
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file_processor.visited_new_blank_line()
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assert file_processor.blank_lines == 1
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def test_inside_multiline():
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"""Verify we update the line number and reset multiline."""
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file_processor = processor.FileProcessor('-', options_from(), lines=[
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'a = 1\n'
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])
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assert file_processor.multiline is False
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assert file_processor.line_number == 0
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with file_processor.inside_multiline(10):
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assert file_processor.multiline is True
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assert file_processor.line_number == 10
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assert file_processor.multiline is False
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@pytest.mark.parametrize('string, expected', [
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('""', '""'),
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("''", "''"),
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('"a"', '"x"'),
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("'a'", "'x'"),
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('"x"', '"x"'),
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("'x'", "'x'"),
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('"abcdef"', '"xxxxxx"'),
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("'abcdef'", "'xxxxxx'"),
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('""""""', '""""""'),
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("''''''", "''''''"),
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('"""a"""', '"""x"""'),
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("'''a'''", "'''x'''"),
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('"""x"""', '"""x"""'),
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("'''x'''", "'''x'''"),
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('"""abcdef"""', '"""xxxxxx"""'),
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("'''abcdef'''", "'''xxxxxx'''"),
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('"""xxxxxx"""', '"""xxxxxx"""'),
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("'''xxxxxx'''", "'''xxxxxx'''"),
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])
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def test_mutate_string(string, expected):
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"""Verify we appropriately mutate the string to sanitize it."""
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actual = processor.mutate_string(string)
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assert expected == actual
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@pytest.mark.parametrize('string, expected', [
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(' ', 4),
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(' ', 6),
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('\t', 8),
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('\t\t', 16),
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(' \t', 8),
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(' \t', 16),
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])
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def test_expand_indent(string, expected):
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"""Verify we correctly measure the amount of indentation."""
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actual = processor.expand_indent(string)
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assert expected == actual
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@pytest.mark.parametrize('token, log_string', [
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[(tokenize.COMMENT, '# this is a comment',
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(1, 0), # (start_row, start_column)
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(1, 19), # (end_ro, end_column)
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'# this is a comment',),
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"l.1\t[:19]\tCOMMENT\t'# this is a comment'"],
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[(tokenize.COMMENT, '# this is a comment',
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(1, 5), # (start_row, start_column)
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(1, 19), # (end_ro, end_column)
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'# this is a comment',),
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"l.1\t[5:19]\tCOMMENT\t'# this is a comment'"],
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[(tokenize.COMMENT, '# this is a comment',
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(1, 0), # (start_row, start_column)
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(2, 19), # (end_ro, end_column)
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'# this is a comment',),
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"l.1\tl.2\tCOMMENT\t'# this is a comment'"],
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])
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def test_log_token(token, log_string):
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"""Verify we use the log object passed in."""
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LOG = mock.Mock()
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processor.log_token(LOG, token)
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LOG.log.assert_called_once_with(
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5, # flake8._EXTRA_VERBOSE
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log_string,
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)
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@pytest.mark.parametrize('current_count, token_text, expected', [
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(None, '(', 1),
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(None, '[', 1),
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(None, '{', 1),
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(1, ')', 0),
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(1, ']', 0),
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(1, '}', 0),
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(10, '+', 10),
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])
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def test_count_parentheses(current_count, token_text, expected):
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"""Verify our arithmetic is correct."""
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assert processor.count_parentheses(current_count, token_text) == expected
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